Synthesis of PdS-CdSe@CdS-Au nanorods with asymmetric tips with improved H2 production efficiency in water splitting and increased photostability

doi:10.1016/S1872-2067(17)62970-X

Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (3): 407-412.DOI: 10.1016/S1872-2067(17)62970-X

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Synthesis of PdS-CdSe@CdS-Au nanorods with asymmetric tips with improved H₂ production efficiency in water splitting and increased photostability

Xianmei Xiang, Lingjun Chou, Xinheng Li

State Key Laboratory for Oxo Synthesis and Selective Oxidation and Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics(LICP), Chinese Academy of Sciences, Suzhou 215123, Jiangsu, China

Received:2017-09-25 Revised:2017-10-30 Online:2018-03-18 Published:2018-03-10
Contact: 10.1016/S1872-2067(17)62970-X
Supported by:
This work was supported by the National Key Research and Development Program of China (2016YFE0105700), the National Natural Science Foundation of China (21573263), and Provincial Fundamental Research Plan of Jiangsu (BK20151236).

Abstract

Abstract:

Charge separation is a crucial problem in photocatalysis. We used a wet-chemical method to synthesize asymmetrically tipped PdS-CdSe-seeded CdS (CdSe@CdS)-Au nanorod (NR) heterostructures (HCs). In these HCs, electrons and holes are rapidly separated and transported to opposite ends of the NRs by internal electric fields. Their ultraviolet-visible absorption spectra showed strong electronic coupling between both tips and the CdS body. PdS-CdSe@CdS-Au achieved a H₂ production rate of ca. 1100 μmol in 5 h; this is two orders of magnitude greater than the rate achieved with Au-CdSe@CdS NRs with only one tip. PdS-CdSe@CdS-Au NRs can withstand 4 h of photoirradiation, compared to 1.5 h for CdSe@CdS NRs, indicating that the photostability of PdS-CdSe@CdS-Au is much better than that of CdS. The greatly improved photocatalytic activity and stability are attributed to efficient charge separation and rapid charge transport in the PdS-CdSe@CdS-Au HCs.

Key words: Photocatalysis, Charge separation, Cocatalyst, Heterostructure, Water splitting

Xianmei Xiang, Lingjun Chou, Xinheng Li. Synthesis of PdS-CdSe@CdS-Au nanorods with asymmetric tips with improved H₂ production efficiency in water splitting and increased photostability[J]. Chinese Journal of Catalysis, 2018, 39(3): 407-412.

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Synthesis of PdS-CdSe@CdS-Au nanorods with asymmetric tips with improved H₂ production efficiency in water splitting and increased photostability

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